Variable wind ripple migration at Great Sand Dunes National Park and Preserve, observed by timelapse imaging

Geomorphology ◽  
2011 ◽  
Vol 133 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
Ralph D. Lorenz ◽  
Andrew Valdez
Keyword(s):  
National Park ◽  
Sand Dunes ◽  
Ripple Migration ◽  
Variable Wind

Tracking rapid landscape change with repeated photography, Gros Morne National Park, Canada

2017 ◽  
Vol 53 ◽  
pp. 115-126 ◽  
Author(s):  
Antony Berger
Keyword(s):  
National Park ◽  
Slope Failure ◽  
Gravitational Instability ◽  
Sand Dunes ◽  
Temporal Trends ◽  
Physical Stability ◽  
Ecological Integrity ◽  
Rock Falls ◽  
Patterned Ground ◽  
Frost Heaving

At various coastal and inland sites in and around Gros Morne National Park in western Newfoundland, photographs taken periodically over many decades illustrate the physical stability of landforms. ἀese images provide a convenient, qualitative way to track the development of stone rings and patterned ground, the movement of rocks along intertidal platforms, changes to marine estuaries and to alluvial rivers and fans, temporal trends in late-lying snow beds along mountain tops, and slope failure by landslides and rock falls. ἀis study has established a spatial and temporal photographic record of slope failures along the steep cliḀs of Western Brook Pond, showing that nearly all of the sites identiᴀed in earlier studies as high risk of failure have remained stable. In contrast, thin-skinned landslides along Winter House Brook have remained active for at least 100 years. Little evidence of physical changes in patterned ground features in Trout River Gulch was found, other than frost-heaving in soils disturbed by road construction. Fluctuations from year to year in the level of gravel beaches along parts of the coast are common, and blow-outs continue to modify coastal sand dunes. Apart from certain engineered sites where change was obviously driven by direct human activities, the immediate cause or “driver” of change was natural (non-human), the result of gravitational instability, heavy precipitation, wave and storm action, frost heaving, and other background processes of the sort that long pre-date the coming of people to the region. Continuation of this kind of inexpensive, non-invasive monitoring can assist in assessing ecological integrity, managing public safety, and interpreting landscape processes for Park visitors.

A new psammophilic Leccinum

1979 ◽  
Vol 57 (2) ◽  
pp. 117-119 ◽  
Author(s):  
Scott A. Redhead ◽  
Roy Watling
Keyword(s):  
New Brunswick ◽  
National Park ◽  
Sand Dunes ◽  
Coastal Sand Dunes ◽  
Coastal Sand

Leccinum arenicola Redhead & Watling sp.nov. is described from coastal sand dunes in Kouchibouguac National Park, New Brunswick, Canada. Its probable mycorrhizal partner is Hudsonia tomentosa Nutt.

scholarly journals Inferring Airflow Across Martian Dunes From Ripple Patterns and Dynamics

2021 ◽  
Vol 9 ◽  
Author(s):  
D. R. Hood ◽  
R. C. Ewing ◽  
K. P. Roback ◽  
K. Runyon ◽  
J.-P. Avouac ◽  
...  
Keyword(s):  
Fluid Dynamic ◽  
Sand Dunes ◽  
Simulation Models ◽  
Plan View ◽  
Migration Rates ◽  
Eddy Simulation ◽  
Optical Images ◽  
Ripple Patterns ◽  
Ripple Migration ◽  
And Migration

Large ripples form striking patterns on the slopes of martian sand dunes which can be mapped and tracked using high-resolution optical images. The ripples vary in orientation, wavelength, plan-view morphology, and rates of migration. The variations in the ripple patterns are recognized to signal the effects of the regional and local winds and feedbacks between winds and dune topography. We examine the ripple patterns and the motion of these ripples to interpret airflow dynamics around dunes in the dune field at Nili Patera. We find that coincident changes in ripple patterns and migration rates in dune wakes indicate reattachment lengths of 4–7 brink heights. This reattachment length is similar to length scales of flow reattachment for airflow over dunes measured on Earth despite the differences in aeolian environment. Furthermore, ripples on dune flanks are shown to behave according to terrestrial models for ripple development on steep slopes. Compensating for these slope effects allows them to act as indicators of dune-modified and regional wind directions. Changes in ripple patterns and migration rates also signal the response of dunes and airflow during dune collisions. Collectively, we find that differences in ripple patterns connected to changes in migration rate provide information on airflow over and around dunes. This detailed assessment of ripple measurement and ripple migration rates advances the use of ripples on martian dunes and sand sheets to infer dune- and field-scale wind dynamics. These measurements also indicate that the low density atmosphere on Mars does not significantly modify the behavior of wind-topography interactions compared to Earth. Such observations provide targets for computational fluid dynamic and large-eddy simulation models seeking to reveal complex airflows across dune fields both on Earth and on Mars.

scholarly journals Landscape distribution of oribatid mites (Acari, Oribatida) in Kolkheti National Park (Georgia, Caucasus)*

Zoosymposia ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 221-233 ◽  
Author(s):  
MAKA MURVANIDZE ◽  
LEVAN MUMLADZE ◽  
TEA ARABULI ◽  
ERISTO KVAVADZE
Keyword(s):  
National Park ◽  
Diversity Index ◽  
Sand Dunes ◽  
Oribatid Mite ◽  
Distribution Patterns ◽  
Oribatid Mites ◽  
Species Number ◽  
Humid Forest ◽  
Mite Communities ◽  
Specific Species

The key subject of this investigation was to study distribution patterns of oribatid mites in the main habitats and ecosystems of Kolkheti National Park. Oribatida were studied in 1) sand dunes, 2) Juncus bogs, 3) flooded alder (Alnus barbata C. A. Mey) forests, and 4) humid alder forests. Sampling was conducted in November 2009 at 18 sites along three transects. For exploratory analysis, we applied clustering techniques. Correlation between species number, density and humus was calculated. Chao1 statistics were used to estimate the completeness of sampling. Forty six oribatid species were recorded. The highest Shannon diversity index was registered for alder forests, whereas the lowest index was observed for dunes. In sand dunes 16 species were found, three of which occurred only in this landscape. In Juncus bogs, 32 species were recorded, and 16 were unique to this landscape, including bog specific Zetomimus furcatus (Warburton & Pearce, 1905), Euzetes globulus (Nicolet, 1855) and Punctoribates manzanoensis Hammer, 1958. Twenty two species were found in flooded forests, seven being exclusive. Ten species were recorded in humid forests, and Metabelbella macerochaeta Bulanova-Zachvatkina, 1965 and Eremobelba geographica Berlese, 1908, typical inhabitants of humid forest soils, appeared as exclusive species. Faunal comparisons among landscapes show high similarity between dune and bog oribatid mite communities, followed by flooded and humid alder forests. In dunes and bogs, total faunal density is determined by euryecological species, whereas in alder forests density was determined by high abundance of humid and extremely humid specific species.

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